I see. Perhaps you may be right. The issue with re-baptizing on the premis that it was not valid because it was performed by the Catholic Church…

That would be a hard situation to defend against apostasy. But the rejection of a certain interpretation of Catholic baptism? Like if one was baptized as an infant and never really accepted the practice, then in their adult age of responsibility decides to receive a baptism in an evangelical church…? Because their (evangelical) belief (as misunderstood as it may be) is not a point of saving grace, but a dedication someone makes to the Lord.
Trust me, I cringe at the thought of re-baptizing, considering the first was done in the name of the Trinity and using water. But I try to stay away from throwing the term apostasy towards anyone who still holds to a genuine faith in the gospel.
Usually, like I mentioned before, the person who leaves the Catholic parish, leaves with alot of assumed accusations against the Church, which dont equate to true understanding of actual teaching from the Church. I have discussed doctrines in great detail to non Cat christians, and they reply with accussations completely different than what I just explained to them!!! Totally frustrating! Some have a spirit of oppositionalism, I think. They are going to have us Catholics worshipping Mary and trying to earn our way into heaven no matter what we tell them otherwise! Oh well.